module.exports = {
    sourceType: 'unambiguous',
    presets: [
      [
        '@babel/preset-env',
        {
          useBuiltIns: 'usage',
          targets: {
            browsers: [
              'last 2 versions',
              'safari >= 7',
              'android >= 4.0',
            ],
          },
          corejs: 2,
        },
      ]
    ],
    plugins: [
      '@babel/plugin-transform-runtime',
      '@babel/plugin-proposal-json-strings',
      '@babel/plugin-proposal-numeric-separator',
      '@babel/plugin-proposal-nullish-coalescing-operator',
      '@babel/plugin-proposal-optional-chaining',
      'istanbul'
    ]
  };
  